/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.config;

import java.util.Map;
import javax.annotation.PostConstruct;
import org.apache.commons.lang3.StringUtils;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.hisp.dhis.external.conf.ConfigurationKey;
import org.hisp.dhis.external.conf.DhisConfigurationProvider;
import org.hisp.dhis.hibernate.encryption.HibernateEncryptorRegistry;
import org.jasypt.encryption.pbe.PooledPBEStringEncryptor;
import org.jasypt.salt.RandomSaltGenerator;
import org.jasypt.salt.StringFixedSaltGenerator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.MethodInvokingFactoryBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author Luciano Fiandesio
 */
@Configuration
public class HibernateEncryptionConfig {
  public static final String TRIPLE_DES_STRING_ENCRYPTOR = "tripleDesStringEncryptor";

  public static final String AES_128_STRING_ENCRYPTOR = "aes128StringEncryptor";

  @Autowired private DhisConfigurationProvider config;

  private String password;

  @PostConstruct
  public void init() {
    password =
        (String) getConnectionProperty(ConfigurationKey.ENCRYPTION_PASSWORD, "J7GhAs287hsSQlKd9g5");
  }

  /** Used only for SystemSettings (due to bug with JCE policy restrictions in Jasypt. */
  @Bean(TRIPLE_DES_STRING_ENCRYPTOR)
  public PooledPBEStringEncryptor tripleDesStringEncryptor() {
    PooledPBEStringEncryptor encryptor = new PooledPBEStringEncryptor();
    encryptor.setAlgorithm("PBEWithSHA1AndDESede");
    encryptor.setPassword(password);
    encryptor.setPoolSize(4);
    encryptor.setSaltGenerator(new StringFixedSaltGenerator("H7g0oLkEw3wf52fs52g3hbG"));
    return encryptor;
  }

  /*
   * AES string encryptor, requires BouncyCastle and JCE extended policy (due
   * to issue mentioned above).
   */
  @Bean(AES_128_STRING_ENCRYPTOR)
  public PooledPBEStringEncryptor aes128StringEncryptor() {
    PooledPBEStringEncryptor encryptor = new PooledPBEStringEncryptor();
    encryptor.setAlgorithm("PBEWITHSHA256AND128BITAES-CBC-BC");
    encryptor.setPassword(password);
    encryptor.setPoolSize(4);
    encryptor.setSaltGenerator(new RandomSaltGenerator());
    return encryptor;
  }

  @Bean
  public HibernateEncryptorRegistry hibernateEncryptors() {
    HibernateEncryptorRegistry registry = HibernateEncryptorRegistry.getInstance();
    registry.setEncryptors(Map.of(AES_128_STRING_ENCRYPTOR, aes128StringEncryptor()));
    return registry;
  }

  @Bean
  public MethodInvokingFactoryBean addProvider() {
    MethodInvokingFactoryBean methodInvokingFactoryBean = new MethodInvokingFactoryBean();
    methodInvokingFactoryBean.setStaticMethod("java.security.Security.addProvider");
    methodInvokingFactoryBean.setArguments(new BouncyCastleProvider());
    return methodInvokingFactoryBean;
  }

  private Object getConnectionProperty(ConfigurationKey key, String defaultValue) {
    String value = config.getPropertyOrDefault(key, defaultValue);

    return StringUtils.defaultIfEmpty(value, defaultValue);
  }
}
